Using a different approval path during requisition import

We are trying to interface requisitions from an external system. We are loading the external data into the PO_REQUISITIONS_INTERFACE_ALL table and running the requisition import to create the requisitions. We can successfully create requisitions using this process. We have a requirement to select a different approval path within the same hierarchy. The users in the external system would select the starting approver in the external system. For example we have hierarchy called HIER and let's say the preparer 'A' of the requisition falls in to the position hierarchy A->B->C under HIER. Now we also have different positions in the same